As of today, we counted a total of 145 unique owner complaints posted to the National Highway Traffic Safety Administration, 126 of which explicitly named the 2014 Cherokee’s transmission. Another 10 transmission complaints were lodged for the new 200, and eight have been posted to the TLX’s log file. There were no complaints recorded for the Evoque.

But these allegations are far worse than the sluggish and delayed gearchanges we’ve experienced testing the Cherokee and Evoque (and yet absent in the 200 and TLX). Cherokee, 200, and TLX owners have each reported conditions such as sudden lunges from unexpected downshifts, a lack of kickdown upon entering highways, front-axle vibration in low gears, and complete failures in which the transmission shifts into neutral while driving and lights up the dash with warning lights. Other owners have reported rollaways in which the vehicle indicated it had engaged park when it was actually in neutral. One of these reported instances involved a Cherokee that went into a lake, having first rolled over someone’s foot and dragged the person into “eight to 10 feet of water,” according to one NHTSA complaint. In December, Honda recalled nearly 9400 Acura TLX sedans for this very problem.

While NHTSA has not launched an investigation, Jeep dealers are replacing between 12 to 15 transmissions a week, according to AN. Aside from Honda, there have been no recalls for this transmission, only lots of frustrated owners from these first-year vehicles.

“We have had to do an inordinate amount of intervention on that transmission, surely beyond what any of us had forecast,” FCA CEO Sergio Marchionne said at the Detroit auto show last month.

ZF told us the problems were entirely due to software and not to anything mechanical, but it would not comment on what specific improvements it was making, as “ZF works independently with each customer based on their needs.”

While automakers each use specific programming and more—Jeep seems to rarely engage ninth while the Range Rover does do more often, and Acura determines its own ratios—there likely will need to be an overreaching update for all models. Based on 2014 sales alone, this gearbox is running in at least 320,000 cars in the U.S., likely more once cars sold late in 2013 and thus far in 2015 are accounted for. New vehicles slated to use the 9HP transmission that are scheduled to go on sale this year include the 2015 Land Rover Discovery Sport, 2015 Jeep Renegade, and 2016 Fiat 500X.